Hi there! I understand you're logging into the Celebrity Cruises app on your Windows device and the check-in option is not showing up. I’d love to help get this sorted for you.

To start, can you tell me a bit more? For example:
- Is your cruise within the check-in window? (App check-in usually becomes available 45 days before your sailing and remains so until the morning of your cruise)
- Have you tried logging out and back in or restarting the app?
- Are you connected to the internet when trying to access check-in?

Meanwhile, here are some initial steps you can try to resolve this:

1. Verify Check-In Window: Make sure your cruise is within the eligible period to check in via the app.
2. Clear Browser/App Cache: Since you’re on Windows using WebKit, clear your browser cache or if you’re using the app via a WebKit-based browser, refreshing the cache can help.
3. Use a Supported Browser or the Official App: Sometimes WebKit browsers may have compatibility issues. If possible, try Chrome, Edge, or Firefox on your Windows 10 PC. Alternatively, use the Celebrity Cruises official app on a mobile device.
4. Check for App Updates: If you’re using an app, ensure it’s the latest version.
5. Sign Out and Sign In Again: This refreshes your session and can prompt app features to reappear.
6. Try Online Check-In Via Browser Directly: Visit the Celebrity Cruises check-in page via your regular browser: Celebrity Cruises Check-In FAQ

If after these steps the check-in still doesn’t appear, it’s possible there might be a temporary issue with the app or server delays. In that case, waiting a short while and retrying or contacting Celebrity support directly might be necessary.

Let me know if you’ve already tried any of these or if you’d like step-by-step help with any of them! Are you sailing within the next 45 days? That can help me tailor the guidance better.